"The Sixense Portal 2 MotionPack™ is custom-designed for use with the high-performance Razer Hydra motion tracking controllers. The MotionPack was designed from the ground up to provide the most advanced and immersive motion control experience ever seen. Reach, rotate and scale your way through both Portal 2 and the exclusive MotionPack test chambers. Intuitively interact with Portal Test Chambers using the Aperture Science Handheld Portal Device in full three dimensions; fire portals at precise angles and throw Weighted Companion Cubes with measured force."